3 Hereafter there shall come— yes, there shall come— a day when you will return a victor to your true country, and will walk through the heavenly Jerusalem crowned with the crown of valor. Then will you receive the citizenship thereof with Paul. Then will you seek the like privilege for your parents. Then will you intercede for me who have urged you forward on the path of victory.
I am not ignorant of the fetters which you may plead as hindrances. My breast is not of iron nor my heart of stone. I was not born of flint or suckled by a tigress. I have passed through troubles like yours myself. Now it is a widowed sister who throws her caressing arms around you. Now it is the slaves, your foster-brothers, who cry, “To what master are you leaving us?” Now it is a nurse bowed with age, and a body-servant loved only less than a father, who exclaim: “Only wait till we die and follow us to our graves.” Perhaps, too, an aged mother, with sunken bosom and furrowed brow, recalling the lullaby with which she once soothed you, adds her entreaties to theirs. The learned may call you, if they please,
The sole support and pillar of your house.
The love of God and the fear of hell will easily break such bonds.
Scripture, you will argue, bids us obey our parents. Yes, but whoso loves them more than Christ loses his own soul. The enemy takes sword in hand to slay me, and shall I think of a mother's tears? Or shall I desert the service of Christ for the sake of a father to whom, if I am Christ's servant, I owe no rites of burial, albeit if I am Christ's true servant I owe these to all? Peter with his cowardly advice was an offense to the Lord on the eve of His passion; and to the brethren who strove to restrain him from going up to Jerusalem, Paul's one answer was: “What mean ye to weep and to break my heart? For I am ready not to be bound only, but also to die at Jerusalem for the name of the Lord Jesus.” The battering-ram of natural affection which so often shatters faith must recoil powerless from the wall of the Gospel. “My mother and my brethren are these whosoever do the will of my Father which is in heaven.” If they believe in Christ let them bid me God-speed, for I go to fight in His name. And if they do not believe, “let the dead bury their dead.”
Source: Letters (New Advent)